Association learning and visual discrimination

The effect of learned stimulus associations on visual discrimination was measured in four experiments. The stimuli were visual shapes which had been scaled for similarity. Two shapes were selected as discriminanda, and each S was pretested and posttested for discrimination of these briefly presented simultaneous pairs of “same” and “different” shapes. During the training, each discriminandum was paired with another simultaneously presented associated shape on a paired-associate response-learning task. The two associated shapes were very similar, intermediate in similarity, or very dissimilar. There was more improvement in posttest discrimination following training with dissimilar associates. We conclude that learned stimulus associations affect visual discrimination.     

Analysis of certified public accounting subgroup and accounting student personality traits using the California Psychological Inventory

Samples of 56 male certified public accounting firm employees and 24 male accounting undergraduate students were given the CPI to test for subgroup differences in personality traits. The samples were also compared with eight occupational groups reported in the CPI manual. A statistical analysis of CPI scale mean score differences indicates a dichotomy of the accounting sample with the older accountants more conservative, conforming and restrictive than the younger accountants.     

The photo-lickerandum: A device for detecting the licking response,with capability for near-instantaneous programming of variable quantum reinforcement

A combined operandum-feeder is described that eliminates the necessity of passing an electrical sensing current through S while detecting and reinforcing tongue-licking responses. A glass nozzle for dispensing liquid reinforcers is situated just above a small separation in a loop of photo-conducting Sterite tubing; licks at a tiny area below the nozzle break a light beam and are detected via a photo-resistor and associated circuitry. Data are presented from a study in which rats worked at the operandum on a mult FR 40 ext schedule; performance and records are comparable to those obtained via conventional electronic sensing. Applications of the photo-lickerandum and an associated variable-quantum reinforcing system are suggested.     

Parallel visual processing: Constant same-different decision latency with two to fourteen shapes

Fourteen Os were shown 2, 5, 8, 11, or 14 geometric shapes at a 200-msec exposure. The maximum visual extent was the same for all numbers of shapes. The stimulus conditions were: all shapes identical, 1 shape different from the rest, and, for 5 to 14 shapes, 3 shapes different (4 shapes in all). The number of shapes, the condition, and the shapes used varied randomly through the sequence of 160 exposures. Decision latency to correct same or different response was independent of the number of shapes presented. Correct same and three-different decisions were faster than one-different decisions, but with two shapes different decisions were faster than same. The results suggest that same-different decisions are made with information processed in parallel from many stimuli     

The value of action and inference in dynamic decision making

The use of action- versus judgment-oriented decision strategies in a dynamic decision task is investigated. Subjects engaged in a simulated medical decision-making task, where the goal is to select treatments in order to cure patients suffering from an unknown disease. The experiment manipulated two task factors that were predicted to influence the effectiveness and efficiency of action- and judgment-oriented strategies: (1) the availability of a decision aid that promotes the interpretability of outcome feedback in the task and (2) the level of risk associated with treatment choices, which influences the opportunity for corrective actions to compensate for earlier decision errors. Results indicated that these manipulations did in fact influence performance. However, most subjects did not use action-oriented strategies even when they would have led to superior performance. Possible explanations for this finding are discussed and the implications for theoretical accounts of strategy acquisition and selection are considered.     

Contextual Effects in Judgments of Crimes,Criminals, and the Purposes of Sentencing1

Content analyses of crime coverage in the news media (e.g., Graber, 1980) consistently demonstrate the overrepresentation of crimes of violence. It was hypothesized that in addition to direct effects upon members of the public (e.g., leading people to overestimate the number of violent crimes) this would also have several indirect effects. Reading about crimes of high seriousness might lead the public to (a) view other offenses more seriously, (b) regard other offenders more negatively, (c) punish other offenders more severely, and (d) emphasize the importance of retribution as a sentencing goal. Two experiments were conducted, using 90 members of the general public as subjects, to test these hypotheses. In Experiment I, subjects first read a news story about a crime that was of high, medium, or low seriousness. Later they rated an unrelated offender and offense more negatively, and were more punitive in their sentences, if the earlier offense had been very serious. There was equivocal support for the hypothesis that changes in punitiveness are caused by subjects shifting to a punishment-oriented sentencing strategy. Rather, it would appear that harsher penalties resulted from changes in perceptions of offense seriousness. These findings are discussed, as are future research directions.     

THE EFFECTS OF AN ENVIRONMENTAL “ENRICHMENT” PROGRAM ON THE BEHAVIOR OF INSTITUTIONALIZED PROFOUNDLY RETARDED CHILDREN

This study determined the effects of procedures designed to “enrich” the physical and social environment of an institutional ward on the “adaptive” and “maladaptive” child, adult, self, and object-directed behaviors of five profoundly retarded ambulatory females. Behavior observed in two treatment conditions, an environment “enriched” with toys and objects and an “enriched” environment coupled with differential reinforcement of adaptive behavior, was compared to behavior occurring in corresponding baseline or “austere” conditions and during a period of noncontingent reinforcement. The results generally revealed: (1) little change in adaptive and maladaptive child and adult-directed behavior across conditions, (2) an overall higher incidence of adaptive object-directed behavior and reduced self-directed maladaptive behavior in each treatment condition from that observed in corresponding control conditions, and (3) the use of an “enriched” environment and differential reinforcement of adaptive behavior resulted in maladaptive self-directed behavior being reduced and adaptive object-directed behavior being increased beyond that observed in the “enriched” environment alone. These behavioral gains were largely maintained during a follow-up condition by continuing the “enriched” environment and transferring the responsibility for differential reinforcement to direct-care staff.